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FUNCTION Nissan Altima L31 facelift

Brake Control System 23 illustrations ~1813 words

FUNCTION

When a problem occurs in the ABS, the ABS warning lamp on the instrument panel comes on. When a problem occurs in the TCS, the TCS OFF indicator lamp and SLIP indicator lamp on the instrument panel come on.

To activate the self-diagnostic results mode, ground the self-diagnostic (check) terminal located on data link connector. The location of the malfunction is indicated by the ABS warning lamp or SLIP indicator lamp flashing.

Scheme 106

Scheme 106: SELF-DIAGNOSIS PROCEDURE
Scheme 106: SELF-DIAGNOSIS PROCEDURE

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Scheme 107

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Scheme 108
  1. Drive vehicle over 30 km/h (19 MPH) for at least one minute.
  2. Turn ignition switch OFF.
  3. Ground terminal 9 of data link connector with a suitable harness.
  4. Turn ignition switch ON while grounding terminal 9. Do not depress brake pedal. Do not start engine.
  5. After 3.0 seconds, the SLIP indicator lamp starts flashing to indicate the malfunction code No.
  6. Verify the location of the malfunction with the malfunction code chart. Refer to " «SELF-DIAGNOSTIC RESULTS MODE»(ref-232745-S36587487202006052000000) ". Then make the necessary repairs following the diagnostic procedures.
  7. After the malfunctions are repaired, erase the malfunction codes stored in the control unit. Refer to " «HOW TO ERASE SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)»(ref-232745-S12025828592006052000000) ".
  8. Repeat the self-diagnostic procedure to verify that the malfunction codes have been erased.
  9. Disconnect the data link connector terminal 9 from ground. The self-diagnostic results mode is now complete.
  10. Verify that the ABS warning lamp, TCS OFF indicator lamp and SLIP indicator lamp remain off after driving vehicle over 30 km/h (19 MPH) for at least one minute.
  11. After making certain that the ABS warning lamp, TCS OFF indicator lamp and SLIP indicator lamp do not come on, test the ABS/TCS in a safe area to verify that it functions properly. NOTE: The indication terminates after five minutes. However, when the ignition switch is turned from OFF to ON, the SLIP indication starts flashing again. The TCS OFF indicator lamp and ABS warning lamp remain lighted.

Scheme 109

Scheme 109: HOW TO READ SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)
Scheme 109: HOW TO READ SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)
  1. Determine the code No. by counting the number of times the ABS warning lamp or SLIP indicator lamp flashes on and off.
  2. When several malfunctions occur at one time, up to three code numbers can be stored; the latest malfunction will be indicated first.
  3. The indication begins with the start code 12. After that, a maximum of three code numbers appear in the order of the latest one first. The indication then returns to the start code 12 and the sequence is repeated (the indication will stay on for five minutes at the most).
  4. Refer to " «SELF-DIAGNOSTIC RESULTS MODE»(ref-232745-S36587487202006052000000) ".

Scheme 110

Scheme 110: HOW TO ERASE SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)
Scheme 110: HOW TO ERASE SELF-DIAGNOSTIC RESULTS (MALFUNCTION CODES)
  1. Disconnect data link connector terminal 9 from ground (ABS warning lamp will stay lit).
  2. Within 12.5 seconds, ground the data link connector terminal 9 three times. Each terminal ground must last more than 1 second. The ABS warning lamp turns off after the erase operation has been completed.
  3. Perform self-diagnosis again. Refer to " «SELF-DIAGNOSIS PROCEDURE»(ref-232745-S16629448812006052000000) ". Only the start code should appear, no malfunction codes.

After the erase operation is completed, it is necessary to repeat the self-diagnostic procedure to verify that malfunction codes no longer appear. Only the start code (12) should be indicated when erase operation is completed and system is functioning normally.

Note. The TCS OFF indicator lamp and ABS warning lamp remain on.

Scheme 111

Scheme 111: Preliminary Check
Scheme 111: Preliminary Check

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Scheme 112

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Scheme 113

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Scheme 116
  1. CHECK BRAKE FLUID LEVEL Low fluid level may indicate brake pad wear or leakage from brake line. Is brake fluid filled between MAX and MIN lines on reservoir tank and is brake fluid clean and free of contamination? OK: GO TO 2. NG: Repair. GO TO 2.
  2. CHECK BRAKE LINE Is leakage present at or around brake lines, tubes or hoses, or are any of these parts cracked or damaged? OK: GO TO 3. NG: Repair. GO TO 3.
  3. CHECK BRAKE BOOSTER OPERATION Check brake booster for operation and air tightness. Refer to " «AIRTIGHT CHECK»(ref-232743-S26918300102006052000000) ". Is brake booster airtight and functioning properly? YES: GO TO 4. NO: Replace. GO TO 4.
  4. CHECK BRAKE PADS AND ROTORS Check brake pads and rotors. Refer to " «FRONT DISC BRAKE»(ref-232743-S35151443582006052000000) " and " «REAR DISC BRAKE»(ref-232743-S01022664662006052000000) ". Are brake pads and rotors functioning properly? YES: GO TO 5. NO: Replace.
  5. RECHECK BRAKE FLUID LEVEL Check brake fluid level in reservoir tank again. Is brake fluid filled between MAX and MIN lines on reservoir tank and is brake fluid clean and free of contamination? OK: GO TO 6. NG: Add brake fluid as necessary.
  6. CHECK WARNING LAMP AND INDICATOR LAMPS ACTIVATION Do ABS warning lamp, TCS OFF indicator lamp and SLIP indicator lamp turn on when ignition switch is turned ON? YES: GO TO 7. NO: Check combination meter. Refer to " «SELF-DIAGNOSIS FUNCTION»(ref-232742-S34809544102006051900000) ".
  7. CHECK WARNING LAMP AND INDICATOR LAMPS DEACTIVATION Do lamps turn off when engine is started? YES: GO TO 8. NO: Go to Self-diagnosis. Refer to " «SELF-DIAGNOSIS PROCEDURE»(ref-232745-S24671973392006052000000) ".
  8. DRIVE VEHICLE Drive vehicle at speeds over 30 km/h (19 MPH) for at least one minute. Do warning lamp and indicator lamps remain off after vehicle has been driven at 30 km/h (19 MPH) for at least one minute? YES: Inspection End. NO: Go to Self-diagnosis. Refer to " «SELF-DIAGNOSIS PROCEDURE»(ref-232745-S24671973392006052000000) ".

Scheme 117

Scheme 117: ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND
Scheme 117: ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND
  1. Check continuity between ABS actuator and electric unit (control unit) connector E125 terminals 16 (B) and 19 (B) and ground. Continuity should exist.

Scheme 118

Scheme 118: ABS WARNING LAMP, TCS OFF INDICATOR LAMP, SLIP INDICATOR LAMP ON/OFF TIMING
Scheme 118: ABS WARNING LAMP, TCS OFF INDICATOR LAMP, SLIP INDICATOR LAMP ON/OFF TIMING

Scheme 119

Scheme 119: Malfunction Code Chart (Without CONSULT-II)
Scheme 119: Malfunction Code Chart (Without CONSULT-II)
Code No. (No. of LED flashes)Malfunctioning partReference
42Actuator front right inlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
45Actuator front left outlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
46Actuator front left inlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
51Actuator rear right outlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
52Actuator rear right inlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
55Actuator rear left outlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
56Actuator rear left inlet solenoid valveABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
57 (1)Power supply (Abnormal voltage)ABNORMAL BATTERY VOLTAGE
61Actuator motor or motor relayMOTOR RELAY OR MOTOR
63Solenoid valve relayABS ACTUATOR SOLENOID VALVE OR SOLENOID VALVE RELAY
71Control unitCONTROLLER FAILURE
77CAN communication circuit (CAN initialize, Bus-off, Receive)CAN COMMUNICATION LINE OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
83CAN ATMSG1 receive timeoutCAN COMMUNICATION LINE OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
84CAN TRQDNINH faultCAN COMMUNICATION LINE OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
86CAN ETCOK faultCAN COMMUNICATION LINE OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
87CAN FCOK faultCAN COMMUNICATION LINE OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
88CAN CANOK faultCAN COMMUNICATION LINE OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
(1) Under voltage that is too low, the control unit will disable the ABS. It does not set the ABS in fail-safe condition. Instead, the ABS becomes a conventional brake system. After the power supply has resumed, the warning lamp goes off, making it possible for the ABS to be re-engaged.
(1)Under voltage that is too low, the control unit will disable the ABS. It does not set the ABS in fail-safe condition. Instead, the ABS becomes a conventional brake system. After the power supply has resumed, the warning lamp goes off, making it possible for the ABS to be re-engaged.

MALFUNCTION CODE CHART

Scheme 120

Scheme 120: Symptom Chart
Scheme 120: Symptom Chart
  1. CHECK BRAKE FLUID PRESSURE Check brake fluid pressure distribution. Refer to " «INSPECTION»(ref-232743-S31407066512006052000000) ". Is brake fluid pressure distribution normal? YES: GO TO 2. NO: Perform Preliminary Check. Refer to " «PRELIMINARY CHECK»(ref-232745-S29845045152006052000000) ".
  2. CHECK WHEEL SENSOR Check wheel sensor connector for terminal damage or loose connections. Perform wheel sensor check. Refer to " «WHEEL SENSOR OR ROTOR»(ref-232745-S14616209712006052000000) ". Are wheel sensors functioning properly? YES: GO TO 3. NO: Repair.
  3. CHECK WHEEL BEARINGS Check wheel bearing axial end play. Refer to " «FRONT WHEEL BEARING»(ref-232732-S24208033882006052000000) " or " «REAR WHEEL BEARING»(ref-232752-S39388139422006052000000) ". Is axial end play within specifications? YES: Go to " «2. UNEXPECTED PEDAL ACTION»(ref-232745-S35961964372006052000000) ". NO: Repair as necessary. Refer to " «FRONT WHEEL BEARING»(ref-232732-S24208033882006052000000) " or " «REAR WHEEL BEARING»(ref-232752-S39388139422006052000000) ".

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Scheme 121: 2. Unexpected Pedal Action
Scheme 121: 2. Unexpected Pedal Action

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Scheme 122
Scheme 122
  1. CHECK BRAKE PEDAL TRAVEL Check brake pedal travel. Is brake pedal travel excessive? YES: Perform Preliminary Check. Refer to " «PRELIMINARY CHECK»(ref-232745-S29845045152006052000000) ". NO: GO TO 2.
  2. CHECK BASE BRAKING SYSTEM PERFORMANCE Disconnect the ABS actuator and electric unit (control unit) connector E125 and verify that the braking force is sufficient when the ABS is not operating. After the inspection, reconnect the connector. NOTE: Driving the vehicle with the ABS actuator and electric unit (control unit) disconnected may induce DTCs in electrical control units using CAN communication. After the inspection, clear all DTCs. OK or NG OK: GO TO 3. NG: Perform Preliminary Check. Refer to " «PRELIMINARY CHECK»(ref-232745-S29845045152006052000000) ".
  3. CHECK WARNING LAMP INDICATION Ensure warning lamp remains off while driving. Is warning lamp turned off? YES: GO TO 4. NO: Carry out self-diagnosis. Refer to " «SELF-DIAGNOSIS PROCEDURE»(ref-232745-S24671973392006052000000) ".
  4. CHECK WHEEL SENSORS Check wheel sensor connector for terminal damage or loose connections. Perform wheel sensor check. Refer to " «WHEEL SENSOR OR ROTOR»(ref-232745-S14616209712006052000000) ". Are wheel sensors functioning properly? YES: Check ABS actuator and electric unit (control unit) pin terminals for damage and the connection of harness connector. Reconnect ABS actuator and electric unit (control unit) harness connector. Then retest. NO: Repair as necessary.
  1. CHECK BASE BRAKING SYSTEM PERFORMANCE Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector E125. Drive vehicle and check to see if stopping distance is still long. NOTE: Driving the vehicle with the ABS actuator and electric unit (control unit) disconnected may induce DTCs in electrical control units using CAN communication. After the inspection, clear all DTCs. Is stopping distance still long? YES: Perform Preliminary Check. Refer to " «PRELIMINARY CHECK»(ref-232745-S29845045152006052000000) ". NO: Go to " «2. UNEXPECTED PEDAL ACTION»(ref-232745-S35961964372006052000000) ". NOTE: Stopping distance may be longer than vehicles without ABS when road condition is slippery.
  1. CHECK WARNING LAMP INDICATION Turn the ignition switch ON. Does the ABS warning lamp activate? YES: Carry out self-diagnosis. Refer to " «SELF-DIAGNOSIS PROCEDURE»(ref-232745-S24671973392006052000000) ". NO: Go to " «6. ABS WARNING LAMP DOES NOT COME ON WHEN IGNITION SWITCH IS TURNED ON»(ref-232745-S29976820382006052000000) ". NOTE: ABS does not work when vehicle speed is under 10 km/h (6 MPH).

Scheme 123

Scheme 123: 5. Pedal Vibration and Noise
Scheme 123: 5. Pedal Vibration and Noise
  1. INSPECTION START Pedal vibration and noise inspection. GO TO 2.
  2. CHECK SYMPTOM Apply brake. Start engine. Does the symptom appear only when engine is started? YES: Carry out self-diagnosis. Refer to " «SELF-DIAGNOSIS PROCEDURE»(ref-232745-S24671973392006052000000) ". NO: GO TO 3.
  3. RECHECK SYMPTOM Does the symptom occur only when electrical equipment switches (such as headlamp) are operated? YES: Check for radio, antenna or related wiring that is routed too close to the ABS actuator and electric unit (control unit) and reroute as necessary. NO: Go to " «2. UNEXPECTED PEDAL ACTION»(ref-232745-S35961964372006052000000) ". NOTE: ABS may operate and cause vibration under any of the following conditions. Applying brake gradually when shifting or operating clutch. Low friction (slippery) road. High speed cornering. Driving over bumps and potholes.

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Scheme 124: 6. ABS Warning Lamp Does Not Come On When Ignition Switch Is Turned On
Scheme 124: 6. ABS Warning Lamp Does Not Come On When Ignition Switch Is Turned On

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Scheme 125
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Scheme 126
  1. INSPECTION START Warning lamp circuit inspection. GO TO 2.
  2. CHECK FUSE Check 10A fuse No. 14 for warning lamp. For fuse layout, refer to " «POWER SUPPLY ROUTING CIRCUIT»(ref-232731-S33404734552006051900000) ". Is fuse OK? YES: GO TO 3 NO: If fuse is blown, be sure to eliminate cause of problem before installing new fuse.
  3. CHECK WARNING LAMP ACTIVATION Disconnect ABS actuator and electric unit (control unit) connector E125. Does the ABS warning lamp activate? YES: Replace ABS actuator and electric unit. Refer to " «REMOVAL AND INSTALLATION»(ref-232745-S07473305322006052000000) ". NO: GO TO 4.
  4. CHECK HARNESS FOR SHORT Disconnect ABS actuator and electric unit (control unit) connector E125 and combination meter connector M24. Check continuity between ABS actuator and electric unit (control unit) connector E125 terminal 21 (L/B) and ground. Does continuity exist? YES: Repair harness or connectors. NO: Check combination meter. Refer to " «HOW TO PROCEED WITH TROUBLE DIAGNOSIS»(ref-232742-S03828962252006051900000) ".

Scheme 127

Scheme 127: 7. ABS Warning Lamp Stays On When Ignition Switch Is Turned On
Scheme 127: 7. ABS Warning Lamp Stays On When Ignition Switch Is Turned On

Scheme 128

Scheme 128
Scheme 128
  1. INSPECTION START ABS actuator and electric unit (control unit) inspection. GO TO 2.
  2. CHECK WARNING LAMP Disconnect ABS actuator and electric unit (control unit) connector E125. Connect suitable wire between ABS actuator and electric unit (control unit) connector E125 terminal 21 (L/B) and ground. Does warning lamp activate? YES: GO TO 3. NO: Repair combination meter. Check the following. Harness connector E125 Harness for open or short between ABS actuator and electric unit (control unit) and combination meter. If NG, repair harness or connector.
  3. CHECK HARNESS CONNECTOR Check ABS actuator and electric unit (control unit) pin terminals for damage and the connection of harness connector. Reconnect ABS actuator and electric unit (control unit) harness connector. Then retest. OK or NG OK: Inspection End. NG: Replace ABS actuator and electric unit (control unit). Refer to " «REMOVAL AND INSTALLATION»(ref-232745-S25428709792006052000000) "